fitonline is glad to be able to clarify how to lubricate your home treadmill with the following US video...

 However, one piece of additional advice. You have to get the lubricant oil spread evenly over the impact area of the treadmill deck (where your feet land), and this is hard to do with a spray lube.

You can get applicators, such as this one here (treadmill silicone lubricant) which make it much easier.